Method, recording support and device to calibrate fuel injection
AssigneeRenault Trucks
InventorFlorent Giovaresco
Life of this patent
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Abstract
A method to calibrate the fuel injection in at least one combustion chamber of a Diesel engine includes: a) recording the combustion noise power or amplitude in the combustion chamber over a piston position range [γ1i;γ2i], b) at the same time, recording the piston position during the same piston position range [γ1i;γ2i], c) determining from the preceding recordings for which piston position Kmin-i the measured combustion noise power passes through a minimum Pmin-i when the piston moves from position γ1i to position γ2i, d) adjusting the fuel injection according to the determined piston position Kmin-i.
Claims8
A method to calibrate the fuel injection in at least one combustion chamber of a Diesel engine, the combustion chamber having a piston that moves along a piston stroke between a top dead center and a bottom dead center, the method comprising for at least one combustion chamber:
- a) recording the combustion noise power or amplitude in the combustion chamber over a piston position range [γ1i;γ2i], where γ1i is a piston position where the fuel is injected into the combustion chamber and γ2i is a piston position where the explosion of the injected fuel has already begun,
- b) at the same time, recording the piston position during the same piston position range [γ1i;γ2i],
- c) determining from the preceding recordings for which piston position Kmin-i relative to the top dead center of the combustion chamber, the measured combustion noise power passes through a minimum Pmin-i when the piston moves from position γ1i to position γ2i,
- d) adjusting the fuel injection according to the determined piston position Kmin-i.
A device to calibrate the fuel injection in at least one combustion chamber of a Diesel engine, the combustion chamber having a piston that moves along a piston stroke between a top dead center and a bottom dead center, the device comprising:
- at least one knock sensor fixedly registered to the Diesel engine to measure the combustion noise power or amplitude in the combustion chamber,
- at least one piston position sensor able to sense a piston position along the piston stroke,
- an electronic calculator able to:
- record the measured combustion noise power or amplitude in the combustion chamber over a piston position range [γ1i;γ2i], where γ1i is a piston position where the fuel is injected into the combustion chamber and γ2i is a piston position where the explosion of the injected fuel has already begun,
- at the same time, record the piston position over the same piston position range,
- determine from the preceding recordings for which piston position Kmin-i relative to the top dead center of this combustion chamber the measured combustion noise power passes through a minimum Pmin-i when the piston moves from position to position γ1i to position γ2i, and
- adjust the fuel injection according to the determined piston position Kmin-i.
Dependencies are inferred from the claim text.